如何使用powershell在textbox GUI中显示选定的文件？

Add-Type -AssemblyName System.Windows.Forms

$Form = New-Object System.Windows.Forms.Form
$Form.Text = "选择文件"
$Form.Size = New-Object System.Drawing.Size(400, 200)
$Form.StartPosition = "CenterScreen"

$TextBox = New-Object System.Windows.Forms.TextBox
$TextBox.Location = New-Object System.Drawing.Point(50, 50)
$TextBox.Size = New-Object System.Drawing.Size(300, 20)
$Form.Controls.Add($TextBox)

$Button = New-Object System.Windows.Forms.Button
$Button.Location = New-Object System.Drawing.Point(150, 100)
$Button.Size = New-Object System.Drawing.Size(100, 30)
$Button.Text = "选择文件"
$Form.Controls.Add($Button)

$Button.Add_Click({
    $FileDialog = New-Object System.Windows.Forms.OpenFileDialog
    $FileDialog.Filter = "所有文件 (*.*)|*.*"
    $FileDialog.InitialDirectory = [Environment]::GetFolderPath("Desktop")
    $Result = $FileDialog.ShowDialog()

    if ($Result -eq "OK") {
        $SelectedFile = $FileDialog.FileName
        $TextBox.Text = $SelectedFile
    }
})

$Form.ShowDialog()